Influence of Yb 3+ doping on phase stability and thermophysical properties of (Y 1-x Yb x ) 3 Al 5 O 12 under high temperature

Zhang, Xue; Ma, Yue; Gong, Shengkai; Guo, Hongbo

doi:10.1016/j.ceramint.2017.02.150

Cited by 21 publications

(5 citation statements)

References 27 publications

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“…For LSTN 0.15 , the inhibitory effect of Nb 5+ ions on oxygen vacancies was significant, and the decrease in the number of oxygen vacancies was considered the primary reason for the high thermal conductivity of LSTN 0.15 . Similar decreases in thermal conductivity were observed in many materials, such as (Y 1−x Yb x ) 3 Al 5 O 12 , 38 (Sm 1−x Yb x ) 2 Zr 2 O 7 , 39 and (Sm 1−x La x ) 2 Zr 2 O 7 . 40 The results of the aforementioned performance analysis indicated that the Nb 5+ -ion doping content of LSTN 0.125 was optimal.…”

Section: Effect Of Nb 5+ -Ion Doping On the Thermal Properties Of The...supporting

confidence: 77%

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Zhu

Wang

et al. 2022

J Am Ceram Soc.

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Thermal protection materials with high optical reflectivity, low thermal conductivity, and good high‐temperature stability are required for the development of laser technologies and the protection of the critical equipment components. Herein, we synthesize a novel thermal protective material, La0.9Sr0.1Ti1−xNbxO3+δ (LSTN; x = 0.1, 0.125, 0.15), with different Nb5+‐ion contents using solid‐state sintering. Phase structure analysis demonstrates that LSTN (x = 0.1, 0.125, 0.15) presents a single‐phase monoclinic structure with a uniform element distribution. In particular, the LSTN0.125 ceramic exhibits ultrahigh optical reflectivity (96%, 2300 nm) and excellent thermophysical properties, such as a high thermal expansion coefficient (10.3 × 10−6 K−1, 1000°C), an ultralow thermal conductivity (0.408 W (m K)−1, 300°C), and excellent high‐temperature stability. Aberration‐corrected scanning transmission electron microscopy reveals that the disordered substitution of Nb5+ ions induces numerous lattice distortions and mass fluctuations, which decrease the thermal conductivity, and makes difference in the relative refractive indices of atomic layers causing the high reflectivity of the material. These remarkable properties render the LSTN0.125 ceramic as an ideal alternative for near‐infrared thermal protection applications.

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Section: Effect Of Nb 5+ -Ion Doping On the Thermal Properties Of The...supporting

confidence: 77%

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Zhu

Wang

et al. 2022

J Am Ceram Soc.

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“…As Figure 7(B) shows, intrinsic phonon mean free paths of AlNb x Ta 1‐x O 4 decrease with increasing temperature, where the minimum phonon mean free paths is 0.49 Å and 0.37 Å (900°C) for AlTaO 4 and AlNbO 4 , respectively, while that of AlNb 1/2 Ta 1/2 O 4 is 0.36 Å (900°C). Smaller phonon mean free path means lower thermal conductivity, which is due to the atomic weight mismatch caused by doping and leads to enhanced phonon scattering 44 . The thermal conductivity is reduced by doping Nb atoms in AlTaO 4 , and the thermal radiation resistance of the material can be maintained under the condition of appropriate doping amount, avoiding the phenomenon abnormal rise in thermal conductivity similar to AlNbO 4 at high temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Smaller phonon mean free path means lower thermal conductivity, which is due to the atomic weight mismatch caused by doping and leads to enhanced phonon scattering. 44 The thermal conductivity is reduced by doping Nb atoms in AlTaO 4 , and the thermal radiation resistance of the material can be maintained under the…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

Ferroelastic structure AlNb_1/2Ta_1/2O₄ ceramics with improved thermophysical and mechanical properties

Zhang,

Wang,

Song

et al. 2023

Int J Applied Ceramic Tech

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Effect of B site doping on structural, thermophysical and mechanical properties of AlNbxTa1‐xO4 ceramics obtained by solid‐phase sintering were investigated in this work. Ferroelastic domain structures derived from the reversible second‐order ferroelastic transformation between the tetragonal (t) and monoclinic (m) contribute to improving the high‐temperature fracture toughness of AlNbxTa1‐xO4 ceramics, and the room fracture toughness of AlNb1/2Ta1/2O4 ceramics is 3.4 MPa·m0.5. The brittleness index of AlNb1/2Ta1/2O4 (2.6 μm−0.5) is also lower than AlTaO4, which indicates that has better damage tolerance. Compared with single‐component AlTaO4 and AlNbO4, the AlNb1/2Ta1/2O4 has a lower thermal conductivity due to enhanced phonon scattering caused by mass disorder and lattice distortion effects. Additionally, AlNb1/2Ta1/2O4 has a good match with the coefficient of thermal expansion of ceramic matrix composites (CMCs), and hence, AlNb1/2Ta1/2O4 has a considerable potential to be the candidate material for thermal/environmental barrier coatings (T/EBCs).This article is protected by copyright. All rights reserved

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“…However, the relatively high thermal conductivity and low coefficient of thermal expansion (CTE) of Y 3 Al 5 O 12 are the limitations for its further application. According to the literature [25,26], Yb 2 O 3 doping has the reduced thermal conductivity of Y 3 Al 5 O 12 , but this has little effect on the CTE.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Microstructure and Thermal Conductivity of Plasma-Sprayed (Y0.8Gd0.2)3Al5O12 Coatings

Wang

Zhang

2022

Coatings

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Garnet-type rare earth aluminate compounds are one class of promising potential candidate materials for thermal barrier coatings (TBCs). In this paper, (Y0.8Gd0.2)3Al5O12 (GYAG) coatings are fabricated by air plasma spraying, with the microstructure, high-temperature phase stability, and thermal conductivity investigated. The results showed that the as-deposited GYAG coating was relatively dense, and contained garnet-type (Y0.8Gd0.2)3Al5O12 phase and a small amount of (Y,Gd)AlO3 and amorphous phases. The crystallized GYAG coating exhibited good phase stability from room temperature to 1450 °C. The coating had the lowest thermal conductivity of 1.17 W·m−1·K−1 at 800 °C, approximately 15% lower than that of the yttria-stabilized zirconia (YSZ) coating. After heat treatment at 1100 °C, the coating became denser with some fine grain precipitation, and formed a number of transverse and longitudinal cracks.

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Influence of Yb 3+ doping on phase stability and thermophysical properties of (Y 1-x Yb x ) 3 Al 5 O 12 under high temperature

Cited by 21 publications

References 27 publications

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Ferroelastic structure AlNb_1/2Ta_1/2O₄ ceramics with improved thermophysical and mechanical properties

Preparation, Microstructure and Thermal Conductivity of Plasma-Sprayed (Y0.8Gd0.2)3Al5O12 Coatings

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Influence of Yb 3+ doping on phase stability and thermophysical properties of (Y 1-x Yb x ) 3 Al 5 O 12 under high temperature

Cited by 21 publications

References 27 publications

Optimal Nb5+doping for enhanced optical reflectivity and improved thermophysical properties of La0.9Sr0.1Ti1−xNbxO3+δ

Optimal Nb5+doping for enhanced optical reflectivity and improved thermophysical properties of La0.9Sr0.1Ti1−xNbxO3+δ

Ferroelastic structure AlNb1/2Ta1/2O4 ceramics with improved thermophysical and mechanical properties

Preparation, Microstructure and Thermal Conductivity of Plasma-Sprayed (Y0.8Gd0.2)3Al5O12 Coatings

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Product

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Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Ferroelastic structure AlNb_1/2Ta_1/2O₄ ceramics with improved thermophysical and mechanical properties